Electric welding, brazing, or soldering.



0. KJELLBERG.

ELECTRIC WELDING, BRAZING, 0B SOLDBRING.

APPLICATION FILED AUG.13, 1907.

948,764. Patented Feb.8, 1910.

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UNITED STATES OSCAR KJELLBERG, or

GOTTENBORG, s wnnnn.

ELECTRIC WELDING, BRAZING, R SOLDERING.

Specification of Letters Patent.

Patented Feb. 8, 1910.

Application filed August 13, 1907. Serial No. 388,395.

I of Stora Badhusgatan 7, Gottenborg, in the Kingdom of Sweden, haveinvented certain new and useful Improvements in or Relating to ElectricWelding, Brazing, or Soldering, of which the following is aspecification, reterence being had therein to the accompanying drawing.

In methods of electric welding brazing or soldering hitherto known thereare special difliculties in effecting connections on the under side ofobjects, as it is then difficult to apply the brazing or soldering metalto the joint. This is a great disadvantage in repairing objects which itis expensive to move or in such places where the space available for theworkman is very limited, -as for instance under steam ship boilers.

This invention relates to a simple and practical method of weldingbrazing or soldering electrically whereby the connections on the lowerside of objects can easily be effected.

The brazing or soldering metal, which forms one of the electrodes,preferably-the positive one, is provided with a cover of fireproof,normally non-conducting material that is to say a second class conductorwhich as the brazing or soldering metal is con sumed, extends beyond thesaid metal, at its edges and forms a crater like cavity, and serves as aguide for the molten brazing or soldering metal, which is moved by theelectric current from the positive electrode to the negative one.

The thickness of the sleeve or cover is such, that it is removedautomatically during the welding operation in the same proportion as thebrazing or soldering metal and falls away without contaminating the.said metal.

The accompanying drawing shows the welding of a oint, for instance on asteam boiler, according to this process.

Figures 1 and 2 are a side view and a front view respectively of a joint0., the electrode 6 being in operative position. I

c is the fireroof cover which extends beyond the welding metal 6 at itsedge 9 and forms a guide for the molten metal.

The electrode 6 is mounted in a handle or holder cl of a suitableconstruction.

The welding operation is efi'ected in the following manner: After thecover has been removed from the end of the electrode 6, the latter isapproached to the joint (1, whereby the current passes through theelectrode metal I) and the edge 9 which has been made conducting bysuflicient heating. Thereby the defective place is heated atthis pointand the electrode metal 6 when heated to the welding temperature iscarried on and is pulled or sucked by the electric current from thepositive electrode to the negative electrodei. e. to the defectiveplace, so that the applied metal is nicely welded; The welding operationis continued successively as adjacent portions are heated tothe weldingtemperature.

It may be observed that the electrode e is always to be held at a sharpangle to the working or motive direction marked by anarrow in Fig. 2,the experience having proved that the electrode metal does not attachitself readily to thejo-int, but it bounds or sprinkles away if theelectrode is held at right or-obtuse angles. l The electrode issocarried, that the electrode metal is deposited in successiveembankments or in layersh. When the electrode metal is used up, a newwelding electrode e is fixed in the holder cl, the welding operationbeing then continued.-

By way of example, the electrode cover may consist of chalk andmagnesia, together with a binding substance as potassium,

which produces simultaneously a reducingeffect. Further, the electrodecover may contain such substances as for instance mag nesium, titaniumor vanadium, as impart to the welding place a suitable degree ofhardness or another quality important to the executed connection byforming compounds or alloys with the soldering or brazing metal.

Having now particularly described and ascertained the nature of my saidinvention and inwhat manner the same is to be performed, I declare thatwhat I claim is 1. The herein described method of welding, brazing orsoldering with an electrode containing soldering material consisting inpassing a current to .form an are between the electrode and the parts tobe welded and then moving the electrode in a line parallel to the partwhere the solder is to be applied while held at a sharp angle to theline of movement, so that the soldering material will pass from theelectrode in a continuous stream and be applied in rows and layers tothe parts to be welded.

2. Means for welding, brazing or soldering by means of an electric arc,comprising a metallic electrode provided with a cover ofnon-combustible, normally non-conducting-material which is adapted tofall ofi in the same proportion as the electrode metal is consumed.

3. An electrode for electric Welding, braz soldering metal provided witha cover of non-combustible normally non-conducting material, the saidcover containing substances which will form compounds or alloys withthebrazing or soldering metal.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing Witnesses.

. OSCAR KJELLBERG. Witnesses:

E. K. THORSSON,

ERIK BERGsTnoM.

